body{ background-color: #C8EDCC;}
dd{ margin-left: 0}
.shadow-box .book_index{ top: 235px; text-align: center;}
.book_content {padding: 0 20px 40px 20px}

.book_top{ position: absolute; top: 0; left: 0; height: 50%; width: 100%; }
.book_bottom{ position: absolute; top: 50%; left: 0; height: 50%; width: 100%; }

.book_page{position: fixed; bottom: 0; height: 40px; width: 86%;}
.book_page .up{float: left; margin-left: 20px;}
.book_page .down{float: right;}